因为要做一个软件注册的功能，所以今天做了一个小例子，这里的服务器是自己的tomcat服务器，做过j2ee的应该是再熟悉不过了。
RegisterActivity.java
public class RegisterActivity extends Activity { 
    private static final String uriConnection = "10.0.2.2:8080/Register/servlet/RegisterServlet"; 
    //private static final String uriConnection = "192.168.0.5:8080/Register/servlet/RegisterServlet"; 
    Button registerButton; 
    Button registerLaterButton; 
    ProgressDialog progressDialog; 
    EditText firstText; 
    EditText lastText; 
    EditText emailText; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
        setContentView(ister); 
        Create(savedInstanceState); 
        firstText = (EditText) findViewById(ister_first_name_id); 
        lastText = (EditText) findViewById(ister_last_name_id); 
        emailText = (EditText) findViewById(ister_email_id); 
        registerButton = (Button) findViewById(ister_button_id); 
        registerLaterButton = (Button) findViewById(ister_later_button_id); 
        registerButton.setOnClickListener(registerListener); 
        registerLaterButton.setOnClickListener(registerLaterButtonListener); 
    } 
    Handler handler = new Handler() { 
        public void handleMessage(Message msg) { 
            progressDialog.dismiss(); 
            finish(); 
        }; 
    }; 
    View.OnClickListener registerListener = new View.OnClickListener() { 
        @Override 
        public void onClick(View v) { 
            String firstName = Text().toString(); 
            String lastName = Text().toString(); 
            String emailName = Text().toString(); 
            progressDialog = ProgressDialog.show(RegisterActivity.this, 
                    "Register", ""); 
            registerToHost(firstName, lastName, emailName); 
        } 
    }; 
    // 处理客户端和服务器端的请求 
    private void registerToHost(String firstName, String lastName, 
            String emailName) { 
        HttpPost httpRequest = new HttpPost(uriConnection); 
        HttpResponse httpResponse = null; 
        List<NameValuePair> params = new ArrayList<NameValuePair>(); 
        if (!firstName.equals("") && !lastName.equals("") 
                && !emailName.equals("")) { 
            params.add(new BasicNameValuePair("firstName", firstName)); 
            params.add(new BasicNameValuePair("lastName", lastName)); 
            params.add(new BasicNameValuePair("emailName", emailName)); 
        } 
        try { 
            httpRequest.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8)); 
            httpResponse = new DefaultHttpClient().execute(httpRequest); 
        } catch (UnsupportedEncodingException e) { 
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
        } catch (ClientProtocolException e) { 
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
        } catch (IOException e) { 
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
        } 
        // 处理从服务器短来的数据 
        if (StatusLine().getStatusCode() == 200) { 
            System.out.println("Connection OK"); 
            handler.sendEmptyMessage(0); 
            /* 
            * byte[] data = new byte[2048]; try { data = 
            * Entity()); } catch 
            * (IOException e) { // TODO Auto-generated catch block 
            * e.printStackTrace(); } 
            */ 
        } 
    } 
    View.OnClickListener registerLaterButtonListener = new View.OnClickListener() { 
        @Override 
        public void onClick(View v) { 
            finish(); 
        } 
    }; 
} 
l:
<?xml version="1.0" encoding="UTF-8"?> 
<LinearLayout android:orientation="vertical" 
    android:id="@+id/registration_screen_layout_id" android:layout_width="fill_parent" 
    android:layout_height="fill_parent" xmlns:android="schemas.android/apk/res/android">  textstyle

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